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Stockholders' Equity And Stock-Based Compensation (Stock Option Activity) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Stockholders' Equity And Stock-Based Compensation [Abstract]    
Outstanding as of December 31, 2015 18,515,254  
Granted 355,000  
Exercised  
Canceled (1,825,767)  
Outstanding as of December 31, 2016 17,044,487 18,515,254
Number of Options, Vested and expected to vest at December 31, 2016 17,044,487  
Number of Options, Exercisable at December 31, 2016 13,430,734  
Outstanding as of December 31, 2015, Weighted Average Exercise Price $ 3.75  
Weighted Average Exercise Price, Granted 2.36  
Weighted Average Exercise Price, Exercised  
Weighted Average Exercise Price, Cancelled 4.87  
Outstanding as of December 31, 2016, Weighted Average Exercise Price 3.60 $ 3.75
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2016 3.60  
Weighted Average Exercise Price, Exercisable at December 31, 2016 $ 3.89  
Weighted Average Remaining Contractual Term at December 31, 2015 4 years 9 months 18 days 5 years 1 month 6 days
Weighted Average Remaining Contractual Term, Vested and expected to vest at December 31, 2016 4 years 9 months 18 days  
Weighted Average Remaining Contractual Term, Exercisable at December 31, 2016 3 years 9 months 18 days